Help Dynamic Content, please

Hi guys, im totally new at AS3, and im trying to do a simple dynamic content flash. Im used to AS2, im not good at all, but i have tons of flash games/facebooks games with as2.

but, i cant understand the logic for as3 T_T.

i have this:


import fl.transitions.Tween;
import fl.transitions.easing.*;
// CONTENEDOR
var MC:MovieClip = new MovieClip();
MC.x=50;
MC.y=50;
MC.name="MCcontenedor";
addChild(MC);
// FUNCIONES
function apretar(event:MouseEvent):void {
 trace(event.target.name);
 switch (event.target.name) {
  case "botones0" :
   img_grande("1.jpg");
   break;
  case "botones1" :
   img_grande("2.jpg");
   break;
  default :
   break;
 }
}
function mover(event:TimerEvent):void {
 var myTween:Tween=new Tween(btn[cont],"x",Strong.easeOut,btn[cont].x,100*col,1,true);
 cont++;
 if (cont%3==0) {
  col++;
 }
}
// VARIABLES
var fila:Number=0;
var col:Number=0;
var cont:Number=1;
var btn:Array=new Array  ;
var cant:Number;
// GENERAR XML
function generar():void {
 cant=xmlData.item.length();
 //
 var intervalo:Timer=new Timer(1000,cant-cont);
 //
 for (var i:Number =0; i<cant; i++) {
  // CONTENEDOR BOTON
  var botones:MovieClip = new MovieClip();
  botones.name="botones"+i;
  botones.y=100*fila;
  botones.x=stage.stageWidth;
  botones.mouseChildren=false;
  botones.buttonMode=true;
  botones.addEventListener(MouseEvent.MOUSE_DOWN, apretar);
  btn*=MC.addChild(botones);
  // COLUMNA FILA
  fila++;
  if (fila%3==0) {
   fila=0;
   trace(fila+" "+col);
  }
  // BOTON DE BIBLIOTECA
  var item:MCthumb = new MCthumb();
  item.name="MCthumb"+i;
  botones.addChild(item);
  // IMAGEN
  crear_imagen(xmlData.item*.text(),i);
  // TEXTO
  var titulo:TextField = new TextField();
  titulo.width=100;
  titulo.height=25;
  titulo.selectable=false;
  titulo.text=xmlData.item*.@tit;
  botones.addChild(titulo);
  // ANIMACION
  var myTween:Tween=new Tween(btn[0],"x",Strong.easeOut,btn[0].x,100*col,1,true);
  intervalo.addEventListener(TimerEvent.TIMER, mover);
  intervalo.start();
 }
}
// MC LADO
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.addEventListener(Event.RESIZE, onresize);
function onresize(e:Event):void {
 trace(stage.stageWidth+" "+MClado.x);
 MClado.x=stage.stageWidth;
}
// IMAGEN
function crear_imagen(imgPath,num):void {
 var imageLoader:Loader = new Loader();
 var image_url=new URLRequest(imgPath);
 imageLoader.load(image_url);
 btn[num].addChild(imageLoader);
}
// CARGAR IMG GRANDE
var cargado:Number=0;
var total:Number=0;
function img_grande(img:String):void {
 var ldr:Loader = new Loader();
 ldr.load(new URLRequest(img));
 ldr.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onprogress, false, 0, true);
 ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, loaded, false,0,true);
}
function loaded(e:Event):void {
 MCimg.addChild(e.target.content);
}
function onprogress(e:ProgressEvent):void {
 var loadPercent:int = Math.round((e.bytesLoaded/e.bytesTotal)*100);
 cargado=e.bytesLoaded;
 total=e.bytesTotal;
 trace(loadPercent);
}
// CARGAR XML
var xmlLoader:URLLoader = new URLLoader();
var xmlData:XML = new XML();
xmlLoader.addEventListener(Event.COMPLETE, LoadXML);
xmlLoader.addEventListener(IOErrorEvent.IO_ERROR, falloXML, false, 0,true);
xmlLoader.load(new URLRequest("dinamic.xml"));
function LoadXML(e:Event):void {
 try {
  XML.ignoreWhitespace=true;
  xmlData=new XML(e.target.data);
  xmlLoader.removeEventListener(Event.COMPLETE, LoadXML);
  xmlLoader.removeEventListener(IOErrorEvent.IO_ERROR, falloXML);
  generar();
 } catch (err:Error) {
  trace("Error al convertir XML");
  trace(err.message);
 }
}
function falloXML(e:IOErrorEvent):void {
 trace("Error al cargar XML"+ e.text);
}

Let me explain, is a FLASH as3 that call an XML.
So i create a button ,attach movie clip from library , add a dynamic textField, and Load an external Image.

i have: MCcontainer -> button Container[XML item length] -> inside button Container*->(image jpg, textfield, attach movie).

Here is my doubt, if i want to move the Button 3, by logic is MCcontainer.button03.x = 100;

but i can’t!!! i need to put it inside an array and do btn[3].x = 100;
and if i trace the btn array : trace(btn) i get: [object movieclip, object movieclip]… i was looking for my button path like [MCcontainer.button01]
what im doing wrong??

http://www.resetpixel.com/VARIOS/dinamic.rar

thanx!